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Q. Two concentric spherical shells with uniformly distributed masses M1 = kg and M2 = kg are situated as shown . Find the magnitude Find the magnitude of the net gravitational force on a particle of mass m = kg, due to the shells, when the particle is located at radial distance (a) a = m, (b) b = m, and (c) c =m. (Note: a is outside of M2, b is outside of M1 but inside of M2, and c is inside of M1)

Q. A 2.5 kg rectangular air mattress is 2.00 m long, 0.500m wide, and 0.100 m thick. What mass can it support in water before sinking?

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